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hey guys i am working on this uh two-stroke engine and uh its got an oil seal leak so if we go under pressure youll see that uh take a while i think the crank wants to move down there we go there goes about seven and a half psi eight psi okay let it settle down there and you can see its not moving anywhere and when i spin the crank on pressure not that i have to but ill do it anyway do it a few times the needle obviously moves [Music] and it will drop back to the 8 psi [Music] okay slightly over because the crank hasnt returned to center where is it about there thats where it was okay so pressure is fine um now this is where it gets interesting watch this were going to vacuum pull a vacuum now thats psi in pressure and inches of mercury in vacuum this oil seals getting worse and worse actually as i do this but uh so we go to about 15 inches of mercury okay there so its pretty much stable just a bit below now watch this this is why its so important to rotate that crankshaft i